I've been relying on my Pentair Diagnostics to measure my salt level. All summer it has been measuring 3600 or so very consistently. So I haven't added any salt since May. However I have been struggling to keep my chlorine level in the 4 - 6 range without adding chlorine. Everyone keeps telling me to add chlorine until my "SWG can keep up" but that hasn't happened yet. I'm running the SWG at 100% from noon to 8 PM every day. Neighbors with salt water pools in my neighborhood are not adding salt although their pools are generally smaller than mine by about 10,000 gallons.
Another important fact is that I've also had trouble getting my CYA up to the 70-80 range and I've assumed that is why my SWG can't keep up.
So just for fun I bought some AquaCheck test strips. This morning they gave me a reading of 2,720 and the Pentair panel says my salt is 3,650. My Intellichlor generator recommends a range of 3,400 to 3.600. So if the strips are right I need to add salt but I don't know which reading to trust.